Nightingale vs Smule

Nightingale turns songs from local folders or Plex Media Server, Jellyfin, and Navidrome libraries into karaoke tracks with separated vocals, synchronized lyrics, and real-time pitch scoring. Vocal separation uses the UVR Karaoke model or Demucs. WhisperX transcribes and aligns lyrics word by word, and LRCLIB lyrics are used when available. Japanese, Chinese, Cantonese, and Korean songs can use character-level alignment and romanized readings.

After analysis, users can adjust key and tempo and follow pitch scoring. Lyrics can be provided as timed LRC or Enhanced LRC, pasted as plain text for alignment, or edited. Playback backgrounds include 10 GPU shader options, five Pixabay video styles, and video files. The app supports MP4 and MKV videos and experimental UltraStar song folders. Multiple profiles keep separate score histories; navigation can use a gamepad or touch controls. Native Linux, macOS, and Windows builds use CUDA or Metal acceleration when available, with CPU fallback. A web build can run on a Linux computer on a home network and open in a browser. The app is free and open source under GPL-3.0-or-later, describes itself as having no cloud, and encrypts Navidrome login details on disk.

Smule is a singing platform for karaoke, recordings, duets, and musical collaboration, available on Android, iOS, and the web. Its catalog includes more than 15 million songs across genres such as pop, rock, R&B, country, K-pop, and musicals. Singers can shape recordings with reverb, filters, vocal effects, pitch guidance, and key adjustment, then make videos with visual effects and lyric overlays; optional AI-powered voice tools are also available. Users can host or join live karaoke sessions for real-time audiences. Smule describes its singer community as spanning more than 190 countries. The free plan allows users to join existing duets. VIP All Access Pass costs $19.99 a month and adds solo recording, personal duets, group performances, and unlimited catalog access. Subscriptions renew automatically unless canceled at least 24 hours before the current period ends. The iOS app requires iOS 15 or later. Smule says accounts cannot currently be made private, though privacy settings for posted recordings can be changed.